If some hypothetical Comcast customer allowed her upstairs neighbor to use her wireless network, might she experience problems with speed and even get kicked off sometimes? There would be 3 or 4 computers using the account, total. I've read that the number of computers in a neighborhood affects download speed, but am not sure about adding a computer to a single account.
Would it matter if this neighbor habitually kept 15 tabs open? What about when her computer was sleeping (it's an Apple)? We're trying to keep track of when problems occur, but it'd be good to know whether or not it could be causing a problem.
I've run multiple different scans, many times, so I don't think it's malware. This computer does sometimes slow to a crawl doing anything at all. The computer right next to the router never experiences problems, but it is newer and a desktop. This one is a few rooms away; it's an old laptop.
Thanks in advance!